duno about DX, but I got a bar mount off ebay with loads of links for about £6, seems fine, plastic is very shiny, the fittings are a bit tight, the nuts had plastic/glue burs that had to be cleaned out and the bolt heads needed gluing into the plastic bits otherwise they came out when you pressed them through the mounts.

But all that was resolved in 5 minutes and it was a fiver not £30.

Also got a tripod and generic velcro frame/tube mount (curved bit of plastic with rubber on one side and a tripod thread on the other) for ~£2 each

Haven't actualy used any of them yet as I broke my arm the first day out with the camera!